(And the same thing applies if you see username/password fields-just log in.) …but if you instead see something like “Use your Apple ID for iMessage,” touch that and log in with your Apple ID. On your iPhone or iPad, you’ll visit Settings > Messages to check this make sure the “iMessage” option is on at the top… Make sure you’re signed into your Apple ID on both your Mac and on your iOS devices. Happy troubleshooting, folks! Wait, is troubleshooting ever happy?ġ. Below, I’ve listed three things that have resolved the not-syncing problem most often for me, along with some resources from Apple to peruse if you still can’t get everything communicating properly. If that isn’t happening for you, though, there are quite a few troubleshooting steps you could go through. If you send someone a message from your iPhone, you want it to appear on your other devices, right? Of course you do, because you’re smart like that.